Mitsubishi Evolution X. Manual — part 647
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-35
DIAGNOSTIC TROUBLE CODE PROCEDURES <SRS-ECU>
DTC B1206: Passenger’s Air Bag OFF Indicator Light (Open Circuit)
CAUTION
If DTC B1206 is set in the SRS-ECU, always diag-
nose the CAN main bus line.
.
CIRCUIT OPERATION
• Power for the passenger’s air bag OFF indicator
light is supplied from the ignition switch (IG1).
• The passenger’s air bag OFF indicator light illu-
minates when the ignition switch is turned to the
"ON" position and goes out after approximately
seven seconds if there is not a malfunction in the
SRS system.
.
INTERFACE
CIRCUIT
SRS-ECU
AIR BAG OFF
INDICATOR
LIGHT
PASSENGER'S
SIDE
ETACS-ECU
Air Bag OFF Indicator Light Drive Circuit
INSTRUMENT CENTER PANEL
AC708951AB
C-37 (Y)
C-124
Connectors: C-37, C-124
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-36
DTC SET CONDITIONS
This DTC will be set if an open circuit has occurred in
the wiring harness between the passenger’s air bag
OFF indicator light and the SRS-ECU.
.
TROUBLESHOOTING HINTS
• Damaged wiring harnesses or connectors
• Malfunction of the SRS-ECU
• Malfunction of the passenger’s air bag OFF indi-
cator light
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A (Vehicles with
CAN Communication System)
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the
."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
).
STEP 2. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Go to Step 3.
NO : There is an intermittent malfunction such as poor
engaged connector(s) or open circuit (Refer to
GROUP 00, How to Cope with Intermittent
Malfunction
).
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-37
STEP 3. Check the passenger’s air bag OFF indicator light.
(1) It is checked whether the passenger’s air bag OFF indicator
light is normal (Refer to
Q: Is the check result normal?
YES : Go to Step 4.
NO : Replace instrument center panel (Refer to GROUP
52A
− Instrument Panel Assembly
STEP 4. Check the harness for open circuit between
SRS-ECU connector C-37 (terminal No.18) and the
instrument center panel connector C-124 (terminal No.11).
(1) Disconnect the negative battery terminal.
(2) While pushing the part "A" indicated in the figure of the
harness side connector, turn the lock lever to the direction
of the arrow to release the lock lever, and disconnect the
C-37 SRS-ECU connector.
(3) Disconnect the instrument center panel connector C-124.
(4) Check for continuity between the following terminals. It
should be less than 2 ohms.
• SRS-ECU connector C-37 (terminal No.18) and the
instrument center panel connector C-124 (terminal
No.11)
Q: Does continuity exist?
YES : Go to Step 5.
NO : Repair the harness wires. Then go to Step 5.
STEP 5. Measure the voltage at the instrument center
panel connector.
(1) Disconnect the negative battery terminal.
(2) Disconnect the C-124 instrument center panel connector.
(3) Connect the negative battery terminal.
(4) Ignition switch: ON.
(5) Measure the voltage between the C-124 harness side
connector terminal No. 8 and body ground.
• The voltage should measure approximately 12 volts
(battery positive voltage).
Q: Is the measured voltage approximately 12 volts (battery
positive voltage)?
YES : Go to Step 6.
NO : Repair the wiring harness between the fusible link
(34) and the C-124 instrument center panel connector
terminal No. 8.
AC506734
A
AD
Lock lever
AC608812
C-37 Harness side
connector (front view)
C-124 Harness side
connector (front view)
EV
AC608813
C-124 Harness side
connector (front view)
AY
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-38
STEP 6. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC B1206 set?
YES : Replace SRS-ECU (Refer to
NO : There is an intermittent malfunction such as poor
engaged connector(s) or open circuit (Refer to
GROUP 00, How to Cope with Intermittent
Malfunction
).
DTC B1207: Passenger’s Air Bag OFF Indicator Light (Short Circuit between Circuit Terminal)
INTERFACE
CIRCUIT
SRS-ECU
AIR BAG OFF
INDICATOR
LIGHT
PASSENGER'S
SIDE
ETACS-ECU
Air Bag OFF Indicator Light Drive Circuit
INSTRUMENT CENTER PANEL
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